survive/mover.go

package main

import (
	"bytes"
	"image"
	"log"

	_ "embed"
	"image/color"
	_ "image/png"

	"github.com/hajimehoshi/ebiten/v2"
)

var (
	flyeyeImage  *ebiten.Image
	flyeyeImage2 *ebiten.Image
	flyeyeImage3 *ebiten.Image
	shadow       *ebiten.Image

	//go:embed fly-eye.png
	flyeye_img []byte
	//go:embed fly-eye2.png
	flyeye_img2 []byte
	//go:embed fly-eye3.png
	flyeye_img3 []byte
	//go:embed shadow.png
	shadow_img []byte
)

const (
	MoverActionDefault = iota
	MoverActionDamaged
	MoverActionDying
	MoverActionExploding
	MoverActionDead
	MoverActionMax
)

type MoverAction uint

func init() {
	img, _, err := image.Decode(bytes.NewReader(flyeye_img))
	if err != nil {
		log.Fatal(err)
	}
	flyeyeImage = ebiten.NewImageFromImage(img)

	img, _, err = image.Decode(bytes.NewReader(flyeye_img2))
	if err != nil {
		log.Fatal(err)
	}
	flyeyeImage2 = ebiten.NewImageFromImage(img)

	img, _, err = image.Decode(bytes.NewReader(flyeye_img3))
	if err != nil {
		log.Fatal(err)
	}
	flyeyeImage3 = ebiten.NewImageFromImage(img)

	img, _, err = image.Decode(bytes.NewReader(shadow_img))
	if err != nil {
		log.Fatal(err)
	}
	shadow = ebiten.NewImageFromImage(img)
}

type Mover struct {
	Sprite     *ebiten.Image
	Maks       *ebiten.Image
	MaksDest   *ebiten.Image
	Angle      float64
	Pos        Coordinates
	Origin     Coordinates
	Action     MoverAction
	cycles     int
	rotating   bool
	Toggled    bool
	Hit        bool
	Touched    bool
	dyingcount int
}

func NewMover() *Mover {
	m := &Mover{
		Sprite:     ebiten.NewImage(48, 48),
		Maks:       ebiten.NewImage(48, 48),
		MaksDest:   ebiten.NewImage(48, 48),
		Action:     MoverActionDefault,
		cycles:     4,
		Angle:      0,
		rotating:   false,
		Toggled:    false,
		dyingcount: 0,
	}

	m.Maks.Fill(color.White)
	return m
}

func (m *Mover) ToggleRotate() {
	m.rotating = !m.rotating
}

func (m *Mover) SetAngle(a float64) {
	m.Angle = a
}

func (m *Mover) SetOrigin(coords Coordinates) {
	m.Origin = coords
	m.Pos = coords
}

func (m *Mover) Draw() {
	m.Sprite.Clear()
	m.MaksDest.Clear()

	idx := (m.cycles / 8) % 4

	y0 := 0
	y1 := 48
	x0 := 48 * idx
	x1 := x0 + 48

	switch m.Action {
	case MoverActionDefault:
		op := &ebiten.DrawImageOptions{}
		op.GeoM.Translate(14, 40)
		m.Sprite.DrawImage(shadow, op)
		m.Sprite.DrawImage(flyeyeImage.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
	case MoverActionDamaged:
		op := &ebiten.DrawImageOptions{}
		op.GeoM.Translate(14, 40)
		m.Sprite.DrawImage(shadow, op)
		m.Sprite.DrawImage(flyeyeImage2.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
	case MoverActionDying:
		m.dyingcount++
		if (m.cycles/5)%2 == 0 {

			m.MaksDest.DrawImage(flyeyeImage2.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
			op := &ebiten.DrawImageOptions{}
			op.GeoM.Reset()
			op.Blend = ebiten.BlendSourceAtop
			m.MaksDest.DrawImage(m.Maks, op)
			m.Sprite.DrawImage(m.MaksDest, nil)

		} else {
			m.Sprite.DrawImage(flyeyeImage2.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
		}
		if m.dyingcount > 60 {
			m.cycles = 0
			m.SetHit()
		}
	case MoverActionExploding:
		m.Sprite.DrawImage(flyeyeImage3.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
		if idx == 3 {
			m.SetHit()
		}
	default:
	}
}

func (m *Mover) Update() {
	/*
		dx := 0. //40 * math.Cos(float64(m.cycles)/16)
		dy := 0. //40 * math.Sin(float64(m.cycles)/16)

		m.Pos = Coordinates{X: m.Origin.X + dx, Y: m.Origin.Y + dy}
	*/
	/*
		if m.rotating {
			m.Angle = float64(m.cycles) / (math.Pi * 2)
		}
	*/
	m.cycles++
}

func (m *Mover) SetHit() {
	m.Action++ // = (m.Action + 1) % MoverActionMax
}

func (m *Mover) ToggleColor() {
	//m.Toggled = !m.Toggled
	if m.Action == MoverActionDefault {
		m.Action = MoverActionDamaged
	} else if m.Action == MoverActionDamaged {
		m.Action = MoverActionDefault
	}
}